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Cheap flights from Chicago (CHI) to Seattle (BFI)

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0 Children (2~11)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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Cheap flights from Chicago to Seattle in August , September 2026

29 Aug - 17 Sep $ 690.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
Pick dates
26 Aug - 17 Sep $ 691.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
Pick dates
30 Aug - 17 Sep $ 699.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
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Last minute flights from Chicago to Seattle

26 Aug - 31 Aug $ 880.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
Pick dates
29 Aug - 31 Aug $ 880.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
Pick dates
27 Aug - 31 Aug $ 925.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
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One-way flights to Seattle from Chicago

9:20 PM - 4:05 PM
Air Excursions
2 Stops
21h 35m
CHI - BFI
$ 400
Kiwi
Pick dates
9:20 PM - 4:20 PM
Air Excursions
2 Stops
21h 50m
CHI - BFI
$ 400
Kiwi
Pick dates
9:20 PM - 4:05 PM
Air Excursions
2 Stops
21h 35m
CHI - BFI
$ 408
Kiwi
Pick dates

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

Related info for your journey
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.